Condensation in reservoirs
Hydraulic and lubricating oils must be kept free from contamination and water. Most fluid reservoirs must be able to breathe, thus allowing water vapour and solid contaminants to enter. Temperature fluctuations in the reservoir will cause this water vapour to condense which will not only cause oxidation of the oil, but can also lead to considerable mechanical damage.
Filtration and drying: a single process
Standard air breathers remove some of the solid particles but allow water vapour in the air to pass freely. The RMF ’Air conditioner’ or sometimes even called ‘airco’, deals effectively with both so reservoirs can breath clean, dry air. The air is first dried by passage through a column packed with Z-R gel granules. The dried air is then passed through a pleated synthetic fibre filter element (replaceable spin-on type) where solid particles are removed, so that the air reaching the reservoir is both clean and dry.
The uptake of moisture in the molecular sieve can be observed by the change in colour of the humidity indicator granules in the silica gel. They turn from ruby-red (active) to a light orange (replace). The non toxic and non carcinogenic Z-R gel granules are completely replaceable with available refills or sparekits. The operation of the air filter (spin-on canister) can be monitored by an optional ’filter minder’.
These desiccators from RMF Systems can be fitted with a combination of Z-R gel and active coal, this activated carbon will eliminate oil vapour and the smell, it will also prevent the Z-R gel from being contaminated with this oil damp.
The RMF range also offers some desiccant breathers for dehumidification of gearbox applications which have spring loaded (0.01 bar) check valves fitted in the base in opposing directions, opening only whilst inhaling or exhaling. This way there is no atmospheric contact with the air and the Z-R gel under static conditions increasing the lifetime of the drying agent.